Yep, it's definately real. Some details here. I've got the original MGS2 but might still get this new "version 2.5" one (again on PS2 prolly). I'm also thinking of getting the original PS1 MGS as I stopped playing it way before finishing it (it'd be weird for me without a first-person view mode tho).
Quote:
The game is currently in development for Xbox and is due for a US release in November. The European release date is, as yet, unconfirmed. There are also plans to release the updated game on PS2 and PC.